Fiths



F. H. GRIFFITHS.

MANUFACTURE OF HEADED sous, RIVETS, OR THE LIKE.

APPLICATION FILED JULY 23,1918.

1,308,629. Patent0dJulyL1919.

as an -2 ff 6 "UNITED STATES OFFICE.

FRANCIS HENRY GRIFFITHS, OF H ANDSWORTH, BIRMINGHAM, ENGLAND.

MANUFACTURE or HEADED nor/rs, nrvn'rs, on. THE LIKE.

' To all whom it may concern:

Be it known that I, FRANCIS HENRY GRIr- FITIIS, a subject of the King of Great Britain, residing at 101 Crompton road, Handsworth, Birmingham, England, have invented certain new and useful Improved Manufacture of Headed Bolts, Rivets, or the like, of which the following is a specification.

The invention relates to the production of a bolt, rivet, or the like having an integral head formed by heading up the metal of a rod length at one of its ends, and provides an improved process of heading, or head forming, whereby the facets or sides thereof, such as for spanner or socket fit, can be truly sized, shaped and burnished without any subsequent machining or filing up.

The invention contemplates forging the head of a bolt into the head-forming bore of a heading plate and to subsequently use this heading plate as a trimming and finishing plate operative during the removal of the head from the head-forming bore within which said head was firmly fixed by the initial forging operation.

The invention will be clearly understood by the description hereinafter appearing with reference to the accompanying drawings.

Figure 1 shows a vertical section through a die to which the combined heading and finishing plate is fitted, and through a punching tool which by blows displaces the metal into the head-forming bore.

Fig. 2 shows a similar section to Fig. 1 but with the head forged.

Fig. 3 is a plan of the lower portion of Fig. 1.

Fig. 4 represents a vertical section of the heading plate and bolt which are removed from the die as one piece.

Fig. 5 is a plan of Fig. 4.

Fig. 6 is a representation of the finished bolt head.

The process shapes and finishes the head of the bolt from a rod length, a, of the diameter of the shank of the bolt. This rod length tightly fits within a corresponding hole, 0

in a die, 0, so that a part of said length, from which the head is to be forged, pro ects above said hole. To provide in the same die for accommodation of different diameters of rod length said die is fitted with a removwhen the die operates. A bottom abutment to the liner or die is provided by a kicker- Specification of Letters Patent. Application filed July 23,1918. Serial No. 246.316.

' Patented Jul 1, 1919.

out 6, which fits the hole 0 and is in any way mechanically operated, from underneath the die, to remove the rod length after the head has been shaped, the upper surface a of this kicker-out having a shape correspondingto the shape of the shank-end of the bolt.

7 is a heading-plate applied to the die to form the upper part thereof. This )late is removably fitted to a sinking a in t e face of the die body. The bottom of the sinking is flush with the top of the liner (Z, so that the top of said liner provides the bottom of a head-forming bore, 7, provided in the plate, f, true to the axis of the hole 0 Said bore f has parallel sides, and is hexagonal in shape, as the drawings show the process for roviding a hexagonal head to the bolt; but 1t will be obvious that said bore will be always shaped and sized to the head to be produced, as, for instance, square for a square headed bolt, or round for a round headed bolt, or partly round with two facets for a flatted round headed bolt.

g is a punch or punchina tool by which that portion of the rod length standing above the bottom of the bore f and which is heated, is displaced by blows into said head-forming bore f in the manner represented by Fig. 2, the underside of the punch or punching tool being formed at g to provide a chamfer shaping on the head. During the displacement of the metal into the head-forming bore 7 any surplus not required in the head will flatten out in the form of a fin, h, shown in plan in Fig. 5,

which fin is subsequently removed.

After the forging, which firmly attaches the unfinished bolt to the heading-plate f, these two parts as one piece are bodily removed from the die 0 by the kicker-out 6, said parts being shown by Figs. 4 and 5, the punch or punchin tool 9 being carried up to a height permitting of this.

The heading plate is now positioned between tools which provide an abutment for the underside of the plate and pressure against the top-side, 71 of the head, i, to force said head out of the head-forming bore f during which the fin h is cut off and the facets i of the head are drawn and burnished to true spanner fit, said bolt head leaving the heading plate in the direction indicated by the arrow Fig. 4; the resultant bolt having a finished head substantially as represented in Fig. 6.

During this trimming and burnishing operationthe upper edge of the heading plate acts as a cutting off edge to the fin, and the sides of the bore f as a drawing tool.

It is obvious that the bore f may be slightly tapered to increase the drawing operation for a brigl iter burnishing and a better finish td the facets. V 7 a Having now described my inventibn What I claim and desire to secure by Letters Patent is The method of manufacturing a headed belt, rivet or the like, consisting insizing and shaping the head thereof Within a'head forneing bore of a heading plate and retain- 

